/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.optimize.info;

import proguard.classfile.*;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.*;

/**
 * This ConstantVisitor marks all classes that refer to package visible classes or class members.
 *
 * @author Eric Lafortune
 */
public class PackageVisibleMemberInvokingClassMarker extends SimplifiedVisitor
    implements ConstantVisitor, ClassVisitor, MemberVisitor {
    private Clazz referencingClass;

    // Implementations for ConstantVisitor.

    public void visitAnyConstant(Clazz clazz, Constant constant) {}

    public void visitStringConstant(Clazz clazz, StringConstant stringConstant) {
        // Check the referenced class and class member, if any.
        if (stringConstant.referencedClass != clazz) {
            referencingClass = clazz;

            stringConstant.referencedClassAccept(this);
            stringConstant.referencedMemberAccept(this);
        }
    }

    public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant) {
        // Check the referenced class and class member.
        if (refConstant.referencedClass != clazz) {
            referencingClass = clazz;

            refConstant.referencedClassAccept(this);
            refConstant.referencedMemberAccept(this);
        }
    }

    public void visitClassConstant(Clazz clazz, ClassConstant classConstant) {
        // Check the referenced class.
        if (classConstant.referencedClass != clazz) {
            referencingClass = clazz;

            classConstant.referencedClassAccept(this);
        }
    }

    // Implementations for ClassVisitor.

    public void visitAnyClass(Clazz clazz) {
        if ((clazz.getAccessFlags() & ClassConstants.ACC_PUBLIC) == 0) {
            setInvokesPackageVisibleMembers(referencingClass);
        }
    }

    // Implementations for MemberVisitor.

    public void visitAnyMember(Clazz clazz, Member member) {
        if ((member.getAccessFlags() & (ClassConstants.ACC_PUBLIC | ClassConstants.ACC_PRIVATE)) == 0) {
            setInvokesPackageVisibleMembers(referencingClass);
        }
    }

    // Small utility methods.

    private static void setInvokesPackageVisibleMembers(Clazz clazz) {
        ProgramClassOptimizationInfo.getProgramClassOptimizationInfo(clazz).setInvokesPackageVisibleMembers();
    }

    public static boolean invokesPackageVisibleMembers(Clazz clazz) {
        return ClassOptimizationInfo.getClassOptimizationInfo(clazz).invokesPackageVisibleMembers();
    }
}
